﻿// -------------------------------------------------------------------------------------------------------
// LICENSE INFORMATION
//
// - This software is licensed under the MIT shared source license.
// - The "official" source code for this project is maintained at http://mtcagent.codeplex.com
//
// Copyright (c) 2010 OpenNETCF Consulting
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
// associated documentation files (the "Software"), to deal in the Software without restriction, 
// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, 
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial 
// portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE 
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
// -------------------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using OpenNETCF.Web;
using System.Xml.Linq;
using OpenNETCF.IoC;

namespace OpenNETCF.MTConnect
{
    public abstract class MTConnectHandlerBase : IHttpHandler
    {
        public abstract void OnProcessRequest(HttpContext context);

        private IMTConnectProvider m_svc;

        protected internal IMTConnectProvider MTConnectProvider
        {
            get
            {
                if (m_svc == null)
                {
                    m_svc = RootWorkItem.Services.Get<IMTConnectProvider>();
                }
                return m_svc;
            }
        }

        public void ProcessRequest(HttpContext context)
        {
            try
            {
                OnProcessRequest(context);
            }
            catch (Exception ex)
            {
                RespondWithError(context, ex);
            }
        }


        protected virtual void RespondWithError(HttpContext context, Exception exception)
        {
            if (exception is HttpException)
            {
                throw exception;
            }

            var errorCode = ErrorCode.InternalError;

            if (exception is InvalidRequestCommandException)
            {
                errorCode = ErrorCode.InvalidUri;
            }

            var error = new MTConnectError(errorCode, exception.Message);

            var errorDoc = MTConnectProvider.Agent.GenerateErrorDocument(error);

            context.Response.ContentType = "text/xml";
            context.Response.Write(errorDoc.ToString(true));
        }

        public virtual bool IsReusable
        {
            get { return true; }
        }
    }
}
